Agilent Technologies HP E5574A User Manual page 68

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Testing Optical
Couplers
This chapter provides information on how to measure the properties
of optical couplers. It covers the application "Coupler Test".
You can measure the following parameters:
• Coupling Ratio, which means the ratio of the power at one
output to the total power of both outputs.
• Splitting Ratio, which means the ratio of the power at one output
to the power at the other.
• Insertion Loss, which means the ratio of the power at one output
to the input power.
• Excess Loss, which means the ratio of the total power of both
outputs to the input power.
• Directivity, which means the ratio of the power at the secondary
input to the input power.
ATTEN TI O N Before you measure the characteristics of a
coupler, you must at least measure and store the reference power P
ref. If you have not yet stored the reference power, refer to page 31
in section 1.6 "Getting Started".
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